Display word doc in vb.net

Hi, can anyone help me. I've trying to display existing word document in vb.net but i keep getting this error:

D:\System-new\DLIMS\PSM2\FormUserGuideWord.vb(58): Type 'COMExceptionMessageBox.Show' is not defined.

I have add reference (Microsoft word 11.0 because im using ms word 2003) to my project but i still cannot display the word document.
Below is the code that i write to open word document in vb.net 2003: